class Dog:
    cry = "wang~"
    def __init__(self ,cry):
        self.cry = cry
    @classmethod
    def Cry(cls):
        print("狗的叫声通常是：", cls.cry)
if __name__ == "__main__":
    myDog = Dog("Woo~")
    Dog.Cry()
    print("我家的狗是哈士奇，它的叫声是：", myDog.cry)